Improvement in compound engines



UNITED STATES PATENT OFFICE SAMUEL ARCHBOLD, OF CHESTER, PENNSYLVANIA.

IMPROVEMENT IN COMPOUND ENGINES.

Specification forming part of Letters Patent No. 158,666, dated January 12, 1875; application filed September 1, 1874.

, To all whom it may concern:

Be it known that I, SAMUEL AEoEBoLD, of Chester, Delaware county, Pennsylvania, have invented certain Improvements in Compound Marine Engines, of which the following is a specilication:

The main objects of my invention are simplicity and economy in the construction of compound propellerfengines; and these objects I attain by the peculi-ar manner of arranging the large and small cylinders in respect to each other, and by so arranging the condenser that it shall form a part/ot' the frame-work.

lfigure 1 of thev accompanying drawing is a side view ot' my improved compound engine, to be used in connection with a screw-propeller. Fig. 2 is a sectional View of part of Fig. 1; Fig. 3, a plan View of Fig. 1, and Fig. 4 a diagram illustrating the application ot' my invention to side-wheel marine engines.

ln Figs. l, 2, and 3, A is the base-plate, secured to the keelsons B, and having suitable bearings for the propeller-shaft D, on which is a balance-crank, E, a single pin extending from this crank to a second crank, E', on a short shaft, which carries the eccentric F for operating the valves of the engine. The central line x of the small cylinder Gis arranged at right angles, or thereabout, to the central line y y of the large cylinder H, and a is the pipe through which live steam is admitted to the Valve-chest of the small cylinder, and the exhaust steam from the latter is conducted through a pipe, b, to the valve-chest of the large cylinder.

By this arrangement of the cylinders a vacant space is presented between them, and this space I utilize by making it the location of the condenser I, the disposal of whichin a marine engine is always a source of trouble to the designer. By placing the condenser in this position it becomes available as part of the supporting frame-work for the cylinders, the small cylinder being connected to the base-plate by two frames, J J, and the large cylinder by two similar, but larger, frames, J J', and the two pairs ot' frames being connected together by the condenser, in a manner rendered apparent by the drawing to engineers, who will readily understand the simplicity and economy of this frame-work.

I claim as my invention- The combination of the highpressure cylinder Gr and its frames J, the low-pressure cylinder H and its frames J', and the condenser I, secured to the said frames, with the base A and propeller-shaft D, all being arranged as set forth.

1n testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

SAMUEL ARGHBOLD.`

Witnesses: f

HUBERT HowsoN, HARRY SMITH. 

